Aso (安蘇郡, Aso-gun) was a district located in Tochigi Prefecture, Japan.
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As of 2003, the district had an estimated population of 40,915 and a density of 150.59 persons per km². The total area was 271.70 km².
Towns and villages
Merger
References
Aso District, Tochigi Wikipedia(Text) CC BY-SA